The purpose of Obama attacking Fox News is what?

I mean yeah, they obviously lean to the right, but the other news stations lean to the left. So they are all biased, but he is only going to attack the one that disagrees with him? The biases go both ways, so why is he going to try to "demonize" the opposition? Again, no one I know who watches Fox News disagrees that it leans to the right! But most, not all, of the people who watch other news stations say that there is no bias on MSNBC or CNN! Which is a crock! They are ALL biased. So again, why is Obama so intent on shutting down/putting down those that disagree with him?